William b



(No Model.)

W. B. MURRAY.

COMBINED FIRE AND BURGLAR ALARM.

Patented Aug. 21, 1888.

N PETERS. Phowmh n vm, Wnhingkm. D C,

UNITED STATES PATENT OFFICE.

\VILLIAM B. MURRAY, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO NATHAN UNDERVOOD, JR, AND EDVARD D. llIAODONALl), OF

S AME PL AOE.

COMBINED FIRE AND BURGLAR ALARM.

SPECIFICATION forming part of Letters Patent No. 388,216, dated August 21, 1888.

Application filed November 10, 1887. Serial No. 254.734.

To all whom, it may concern:

Be it known that I, W ILLIAM B. MURRAY, a citizen ofthe United States,and a resident ofthe city of Minneapolis, countyof He11nepin,State of Min nesota,have invented a certain new and useful Combined Fire and Burglar Alarm, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to fire and burglar alarms, and it has forits object to simplify the construction of existing mechanism and provide a device of superior elliciency for the purpose.

My invention consists of the construction hereinafter fully described and particularly claimed.

In the drawing, like letters referring to like parts, the figure is a front elevation of my invention.

A represents an inelosing-case of any suitable kind with its front plate removed.

B B are a pair of parallel guides, arranged crosswise of this case in the upper part of the same, and provided with coincident small holes in the same vertical plane. Rods G 0, provided with nuts or springseats d d, are placed with their extremities in these holes. Coiledresistance-springs E E encircle these rods, bearing against the underside of the upper guide, B, and the tops of the springseats or nuts d d, and tend to force the rods downward until the nuts reston the top of thelower guide, B.

To the upper end of the rods O C, in any suitable way, are attached combustible cords F and F, which extend oversuitable supports, as the sheaves or guides G, to the various parts of a room or building most likely to take fire or to be disturbed by burglars, and are made fast at their extremities to some suitable support after havingfirst been drawn taut against the resistance-springs E and E. This part of the construction is identical with that described in my application for patent filed September 9, 1887, Serial No. 249,207, and con stitutes what I call the alarm-cord and its tension device.

In the case A, at some convenient point below the tension device, is placed a bell, H,

(No model.)

and the clock mechanism K, to whose escape ment is is rigidly attached a bell-hammer, J, in proper position to strike the bell. The escapement k is provided with the lever k.

L is a bell-crank lever, whose two arms, H, are at an acute angle to each other. ver is fulcrumed to the ease by the pivot-pin M through a hole at the junction of the two arms, intermediate the tension devices and the clock-work. The arm Z extends across the case directly under the lower extremities of the rods 0 (J, and the arm Z rests against the upper and outer surface of the lever I." in its normal position, locking the escapement k in its inoperative position.

A coiled spring, N, is fastened at one end to the guide B and at the other to the upper part of the long arm Z of the lever L, and serves to keep the arm lalways in contact with thelowermost rod, O or O, and to return the lever L to its normal position, where l will lock the escapement 7.2.

The operation is as follows: \Vhen for any reason any cord, as F or F, is made slack, the rod 0 or C, to which it is attached, is forced downward by its spring E or E and rocks the lever L on its pivot M. The short arm Z is thereby disengaged from the lever L of the eseapement k. The clockwork is thus set free to run and an alarm is sounded. The cord F This leor F will be made slack whenever any part of it is burned in two or any movable part of the buildingas a window or door-to which it may be attached is moved from its normal (closed) position.

Of course it will be readily understood that an indefinite number of cords and tension devices may be usedas, for example, one for each room, or two be used for each room, one for fire and the other for burglars.

It should be noted that the tension devices move different lengths in their guides B B, according to their nearness or remoteness from the pivotal point of the lever 'L. The rod 0, for example, must move through a longer distance than the rod (1 to disengage Z from k.

The retracting-spring N may be of anysuitable kind and attached in any suitable way. All that is necessary is that it tend to keep the lever L in its normal position, and that it be of less power than any one of the tension devices.

It Will be understood that instead of using springs the rods 0 C, &e., may be made of sufficient weight to afford the requisite tension on the cords F F, 850. In that event each rod would be provided with a stop to limit its upward as well as its downward motion. So, also, the lever L might be retracted to its nor mal position by a eounter-weight and cord aeting over a suitable sheave or guide instead of by the spring, as shown.

The clock is the ordinary wellknownspringaetuated movement, and no description of the same is deemed necessary.

What I claim, and desire to secure by Let ters Patent of the United States, is as follows:

In combination, eloelealarm mechanism K 7.: is J H, tension device B 13 C E (Z, bell-crank lever L, fulerumed at M and having its arm I in the path of the movable part (J of said tension device, and having its other arm in engagement with the lever-arni L of the eloekeseapeinent 7.; when in its normal position, a retraction-spring, J, for returning said lever to its normal positiomand the tight combustible cord F, attached at, one end to the movable part 0 of said tension device, extending directly or indirectly to the parts of a room or building likely to take fire or to be disturbed by burglars, as and for the purpose set forth.

WILLIAM B. MURRAY. In presence of- EMMA F. ELMonE, JAs. F. \ViLLnMsoN. 

